Twyer for forges or furnaces.



N0. 673,505. Patented May 7, I90I. J. OVERALL.

TWYEB FOB YFORGES 0B FUBNACES.

(Application led Aug. 4, 1900.)

(No Model.)

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A m w w 417 RNE YS *UNITED STATES PATENT OFFICE.,

TWYER FOR FORGESr` FURNACES.Y

SPECFICATION forming part of Letters Patent N o. 673,505, dated May '7, 1901.

Application iiled August 4, 1900. Serial No. 25,911. (No model.)

To all whom t may concern.-

Be it known that I, JOHN OVERALL, a subject of the Queen of Great Britain, residing at Sydney, in the Colony of New South Wales, have invented a new and usefullmprovement in Twyers for Forges Or Furnaces, of which the following is a specification.

My invention consists of an improved twyer for forges andifurnaces adapted to be blown from a continuous source of supply of air and constructed with a View to the removal of portions of clinker and ashes which find their way into the twyer nozzle and the keeping cool of the twyer by means of the air used in the blast.

Referring to the accompanying sheet of drawings, in which Figure 1 is a longitudinal section, and Fig. 2 a back elevation- 1 is portion Of the frame of the forge, to which the twyer is secured by bolts passing through the bolt-holes 2.

3 is the body portion of the twyer, in the nose 4, of which a tapering blast-nozzle 5, directed upward and outward is formed. The interior of the twyer is divided by a diaphragm 6, above which the air-blast enters through the pipe 7. A stopping-block 8 is tted to the interior face of the nose 4 to act as a closure for the inner end of the nozzle 5. This block 8 is carried on the forward end of a rod 9, being loosely secured thereto by a pin passing through the hole 10. The rod 9 is carried in bearings 11 and 12, the former being a sleeve carried by a bridge piece or bridge pieces screwed into it through the side of the body 3 and the latter being simply a hole bored through the cover 14 of the twyer-body 8. This rod 9 is acted upon by a weight or a spring tending to press the block 8 against the inner face of the nose 4. Through the cover 14 air-vents 15 are made. When the block 8 is in contact with the nozzle 4, so as to close the blast-hole 5, air which enters through the pipe 7 and the passage 16 escapes through these holes 15. When, however, the rod 9 is drawn backward and with it the block 8, so as to al`.

low air to pass out through the blast-hole 5; the escape-holes 15 are closed by plate 17, which is fastened on the rod 9. The rod 9 and its attached parts are shown in their normal position in Fig. 1. They are held in this position either by a spring 18 or a weight 19. When the spring 18 is used, one end of it bears against the cover 14 and the other end of it against the follower-plate 20, which is fastened on the rod 9. The rear end of this spring is larger in diameter than the closing-plate 17,

so that the latter may move within it. When the weight 19 is used, the spring 18 and 'the follower-plate 20 are dispensed with. When the weight 19 is used, it is hung on a flexible line 21, which runs over a sheave 22 and is fastened at 23 to the lever-handle 24. This Alever-handle has its fulcrum on a bracket 25 toward the nose of the twyer.

29 is a clearing-'scuttln-Z, 30adoor thereto, and 31 a latch for the same. A bent pricker may be inserted throughthe scuttle 29 to clear the blast-nozzle 5 of any clinker or ash which may become blocked therein, the stopper-block 8 being drawn back to permit of the entrance of the pricker.

A spring may be placed externally to the rear plate of the twyer to act upon the rod 9 and takethe place of the spring 18.

The twyer shown in the accompanying drawings has been designed for a blacksmiths forge; but it is usable also, the necessary ttings being provided, for a furnace-twyer. Where the furnace is very hot, the shell of the body may be water-jacketed to prevent burning.

There is no novelty, broadly, in a twyer for a blacksmiths forge wherein the air-blast before entering the nozzle passes through a chamber which is fitted with'a blast-stopper and a clearing-scuttle.

My invention consists in the structure of the apparatus described herein and illustrated in the accompanying drawings.

In operation a continuous current of air under the necessary pressure is blown in through the pipe 7. This current of cool air impinges on the upper portion of the nozzle,

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on itsinner side, and keeps the same cool. This portion of the nozzle being nearest to the hottest fire is most liable to burning; but the continuous air-feed keeps it suiciently cool to prevent damage in this manner.

Normally the spring or the weight mechanism keeps the air-nozzle closed by pressing the bleek S against it and et the same time `keeps the air-vents open by withdrawing the closure-plate lfrom them. When the blast is required, the lever 24 is moved over to open the nozzle and close the air-vents by sliding the rod 9 backward. The lever is set by means of the rack 28.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In combination, the twyer having the nozzle, a elosnre for said nozzle, a rod conneeted with the closure, air-vents at the rem' of the twyer and a closure-disk 17 for the said air-vents, said disk being arranged on the rod, substantially as described.

2. A twyer comprising the casing having the nozzle, an inlet for the air, a, closure for the nozzle, a rod connected with the closure, air-vents in the easing, a closure for said airvent earried by the rod and e clearing-senttle independent of the air-vent, substantially as described. p

In testimony whereof I have signed my name to this speeiefttion in t-he presence of two subscribing witnesses.

JOHN OVERALL.

Vitnesses: v

LAURA B. LUCAS, WILLIAM JOSEPH DAvis. 

